diff --git a/pym/cl_opt.py b/pym/cl_opt.py
index 1db62a6..d1d7b1a 100644
--- a/pym/cl_opt.py
+++ b/pym/cl_opt.py
@@ -223,7 +223,7 @@ class opt(optparse.OptionParser):
         },
         {'longOption':"filter",
          'optVal':"FILTER",
-         'help':_("filtered variables, \
+         'help':_("filtered variables (as a regular expression is used *), \
 is used in conjunction with the options '-v - vars'")
         },
         {'longOption':"xml",